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MRK

Merck & Co., Inc.

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MRK in the last 90 days

Merck & Co., Inc. (MRK) had 2 congress transactions by 1 member and no insider purchases in filings from the last 90 days.

FINRA’s latest report (settlement 15 SEPT 2026) shows 34,430,712 shares held short, 4.2 days to cover, up 13.7% from the report before.

  • Congress: 2 purchases and 0 sales reported, amounts in the bands the law requires.
  • Delay: each filing below shows how many days passed between the trade and its publication. None of this is real-time.

Latest filing on file: 09 SEPT 2026 · FINRA settlement 15 SEPT 2026 · public filings, reported as filed

What the price is doing

$144$121 → $144 · +19% over six months

MRK is up 19%. Short sellers still aren't backing off.

Bets against it — they pay off if the price falls — are up 25% over the same stretch.

$121 STARTAPRMAYJUNJULAUGSEPTOCT19 AUG 2026 — Hon. Maria Elvira Salazar — $15,001 – $50,00019 AUG 2026 — Hon. Maria Elvira Salazar — $15,001 – $50,000NOW $144

Politician activityBoughtSold

Short sellers

11 reports · twice a month

APR 0%15 SEPT +25%APRMAYJUNJULAUGSEPTOCT

Money betting MRK falls. Reported twice a month, and it shows up seven working days late.

Politicians

2 buys · 0 sales

Traded over six months

View activity →

Short sellers

Bets up 25%

Over six months · newest 15 SEPT 2026

See the numbers →

Insiders

Nothing reported

Traded over six months

Quiet Money

Our take on how well MRK holds up when sellers show up.

How it holds up · last 60 trading days

Through 21 SEPT 2026

Vulnerable

When MRK gets hit, it tends to drop more easily than usual.

Lately, MRK has been easier to push down than usual.

That's been true for the last 3 trading days.

The last 6 months

ResilientMixedVulnerable
MAYJUNJULAUGSEPT
31 MAR 2026Now · 21 SEPT 2026

What the filings show

What the filings show · last 90 days

2 of 4 sources

+5Balanced

Leaning outBalancedLeaning in

The disclosed money is split, on what has actually been filed. This reads on two of the four sources we track.

Short interest
Short interest rose 17.3% — 29,359,028 to 34,430,712 shares between 15 JUL 2026 and 15 SEPT 2026. See the filings →
-43
Congress
1 member of Congress disclosed 2 purchases and 0 sales. See the filings →
+100

This summarises filings that have already been published — it is not a forecast, a rating of the company, or advice. Every figure above is listed in full further down this page, with the document it came from.

FINRA short interest

Settlement 15 SEPT 2026 · shares held short

34,430,712shares held short

Days to cover

4.23

Avg daily volume

8,139,823

Since last report

+13.68%

As of 15 September 2026, 34,430,712 Merck & Co., Inc. shares were held short — the total across every reporting firm, not one fund's position. That is 4,143,365 shares more than the previous report, a 13.68% increase. At the average daily volume of 8,139,823 shares, that position represents 4.23 days of trading — what the filing calls days to cover.

This is the most recent figure that exists, and it is 17 days old. FINRA collects short interest twice a month, on a settlement date, and publishes it about eight business days later. So nobody has a live short-interest number for MRK — not us, and not anyone quoting one. We print the settlement date on the figure so you always know which day you are looking at.

Across the 12 reports we hold, the position has risen from 27,720,957 shares on 31 March 2026 to 34,430,712 today, a change of 24.2%. The highest reading in that window was 34,430,712 shares on 15 September 2026.

SettlementShares shortDays to cover
15 SEPT 202634,430,7124.23
31 AUG 202630,287,3472.23
14 AUG 202624,506,5202.84
31 JUL 202628,281,3753.25
15 JUL 202629,359,0283.42
30 JUN 202631,381,2672.30
15 JUN 202630,267,2922.57
29 MAY 202630,545,8533.06
15 MAY 202629,060,1873.63
30 APR 202626,205,8682.55
15 APR 202627,495,6903.31
31 MAR 202627,720,9572.53
What is MRK's short interest?
34,430,712 shares, as of the 15 September 2026 settlement date. That is the figure FINRA published, unadjusted.
What percentage of the float is short?
We do not publish that, because FINRA does not publish float. The regulator reports the number of shares held short; turning it into a percentage needs a share count from somewhere else, and different sources disagree about what counts as float. We would rather give you the number that was actually filed than a percentage built on an assumption.
How current is this?
It is 17 days old, and that is as fresh as short interest gets. FINRA measures it twice a month and publishes it seven business days after the settlement date. Any site showing you a "live" short interest figure is showing you something else.
What does days to cover mean?
It is the short position divided by average daily trading volume — here, 4.23. It describes how many days of ordinary trading the position is equivalent to. It is arithmetic from the filing, not a prediction about what will happen.
Where does this come from?
FINRA's consolidated short interest file, which is public. We read it directly and store it unchanged, except that we blank the days-to-cover placeholder FINRA writes when a stock has almost no volume.

Disclosed insider buying on file

—no purchase on file passed the price check

Open-market purchases only — the amount is a fact, not a verdict.

On file here

Short positions0

Insider purchases0

Congress transactions39

Latest change09 SEPT 2026

SHORT POSITIONS · 0INSIDER BUYS · 0CONGRESS · 39

Congress transactions on file

39 disclosed · newest first · every row links to its filing

WhoAmount as filedTradedFiledLag
Hon. Maria Elvira SalazarBOUGHT$15,001 – $50,00019 AUG 202609 SEPT 202621 days
Hon. Maria Elvira SalazarBOUGHT$15,001 – $50,00019 AUG 202609 SEPT 202621 days
Hon. Josh GottheimerBOUGHT$1,001 – $15,00004 FEB 202616 MAR 202640 days
Hon. Julie JohnsonSOLD$1,001 – $15,00018 DEC 202515 JAN 202628 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00019 DEC 202512 JAN 202624 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00018 NOV 202515 DEC 202527 days
Hon. Julie JohnsonSOLD$1,001 – $15,000 · partial13 NOV 202511 DEC 202528 days
Hon. Valerie HoyleSOLD$1,001 – $15,00023 SEPT 202510 OCT 202517 days
Hon. Sheri BiggsSOLD$15,001 – $50,00019 MAR 202505 OCT 2025200 days — the law says 45
Hon. Valerie HoyleBOUGHT$1,001 – $15,00029 OCT 202412 SEPT 2025318 days — the law says 45
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00005 AUG 202512 SEPT 202538 days
Hon. Lisa McClainSOLD$1,001 – $15,00004 AUG 202512 SEPT 202539 days
Hon. Julie JohnsonSOLD$1,001 – $15,000 · partial14 AUG 202511 SEPT 202528 days
Hon. Marjorie Taylor GreeneBOUGHT$1,001 – $15,00028 AUG 202529 AUG 20251 day
Hon. Lisa McClainBOUGHT$1,001 – $15,00024 JUN 202513 AUG 202550 days — the law says 45
Hon. Julie JohnsonBOUGHT$1,001 – $15,00013 JUN 202514 JUL 202531 days
Hon. Scott Scott FranklinSOLD$1,001 – $15,00016 JUN 202514 JUL 202528 days
Hon. Scott Scott FranklinBOUGHT$1,001 – $15,00007 AUG 202403 JUL 2025330 days — the law says 45
Hon. Gilbert CisnerosSOLD$1,001 – $15,00030 MAY 202506 JUN 20257 days
Hon. Rob BresnahanSOLD$15,001 – $50,00015 MAY 202531 MAY 202516 days
Hon. Bruce WestermanSOLD$1,001 – $15,00021 APR 202512 MAY 202521 days
Hon. Jefferson ShreveSOLD$15,001 – $50,00017 APR 202508 MAY 202521 days
Hon. Rob BresnahanBOUGHT$15,001 – $50,00008 APR 202508 MAY 202530 days
Hon. Gilbert CisnerosBOUGHT$1,001 – $15,00029 APR 202506 MAY 20257 days
Hon. Marjorie Taylor GreeneBOUGHT$1,001 – $15,00005 MAY 202506 MAY 20251 day
Hon. Bruce WestermanBOUGHT$1,001 – $15,00003 MAR 202516 APR 202544 days
Hon. Kelly Louise MorrisonSOLD$1,001 – $15,000 · partial20 MAR 202511 APR 202522 days
Hon. Marjorie Taylor GreeneBOUGHT$1,001 – $15,00009 APR 202511 APR 20252 days
Hon. Gilbert CisnerosSOLD$15,001 – $50,000 · partial31 MAR 202507 APR 20257 days
Hon. Rob BresnahanSOLD$15,001 – $50,00025 FEB 202527 MAR 202530 days
Hon. Jefferson ShreveBOUGHT$15,001 – $50,00024 FEB 202509 MAR 202513 days
Hon. Gilbert CisnerosBOUGHT$15,001 – $50,00026 FEB 202506 MAR 20258 days
Hon. Julie JohnsonBOUGHT$1,001 – $15,00017 JAN 202512 FEB 202526 days
Hon. Gilbert CisnerosSOLD$1,001 – $15,00024 JAN 202511 FEB 202518 days
Hon. Josh GottheimerSOLD$15,001 – $50,00027 JAN 202510 FEB 202514 days
Hon. Jared MoskowitzSOLD$1,001 – $15,00015 JAN 202510 FEB 202526 days
Hon. Jared MoskowitzSOLD$1,001 – $15,00015 JAN 202510 FEB 202526 days
Hon. Byron DonaldsSOLD$1,001 – $15,00016 JAN 202510 FEB 202525 days
Hon. Byron DonaldsSOLD$1,001 – $15,00016 JAN 202510 FEB 202525 days
What this page will never showNo price targetsNo score out of 100No buy or sell callsNo predictionsDocuments, dates, and how late they were.